胃肠肿瘤病人 ,特别是中晚期病人 ,常存在着不同程度的蛋白质热量营养不良。营养不良者还常伴有免疫功能低下[1 ,2 ] 、微量元素和维生素缺乏 ,以及血清磷、镁降低等。对营养不良病人 ,采用营养支持治疗的积极意义已得到共识 ,但在具体实施上 ,仍存在不少争议[3] 。1　胃肠肿瘤 Gastrointestinal cancer patients, especially in advanced patients, there are varying degrees of protein calorie malnutrition. Malnourished people often accompanied by immune dysfunction [1,2], lack of trace elements and vitamins, and serum phosphorus, magnesium and so on. For malnutrition patients, the use of nutritional support for treatment of positive meaning has been agreed, but in the specific implementation, there are still many controversies [3]. 1 gastrointestinal tumor